// 默认不允许在任何表达式中使用不必要的括号
const b = 10;
const c = 20;
export const a = (b * c);

export const d = (a * b) + c;

export const myType = typeof (a);

a = (b * c);

(a * b) + c;

for (a in (b, c));

for (a in (b));

for (a of (b));

typeof (a);

(Object.prototype.toString.call());

class A {
  [(x)] = 1;
}

class B {
  x = (y + z);
}